US4385756A - Sheet inverting and stacking apparatus - Google Patents

Sheet inverting and stacking apparatus Download PDF

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Publication number
US4385756A
US4385756A US06/182,340 US18234080A US4385756A US 4385756 A US4385756 A US 4385756A US 18234080 A US18234080 A US 18234080A US 4385756 A US4385756 A US 4385756A
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US
United States
Prior art keywords
sheet
slot
stacking apparatus
inverting
wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/182,340
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English (en)
Inventor
Jack Beery
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to US06/182,340 priority Critical patent/US4385756A/en
Assigned to XEROX CORPORATION, A CORP. OF N. Y. reassignment XEROX CORPORATION, A CORP. OF N. Y. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BEERY JACK
Priority to JP56131441A priority patent/JPS5772559A/ja
Priority to GB8126116A priority patent/GB2082550B/en
Application granted granted Critical
Publication of US4385756A publication Critical patent/US4385756A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/38—Delivering or advancing articles from machines; Advancing articles to or into piles by movable piling or advancing arms, frames, plates, or like members with which the articles are maintained in face contact
    • B65H29/40—Members rotated about an axis perpendicular to direction of article movement, e.g. star-wheels formed by S-shaped members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/421—Forming a pile
    • B65H2301/4212—Forming a pile of articles substantially horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/60—Other elements in face contact with handled material
    • B65H2404/65—Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel
    • B65H2404/651—Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel having at least one element, e.g. stacker/inverter

Definitions

  • This invention relates to sheet inverting and stacking apparatus and in particular to the inverting and stacking of sheets produced from automatically reproducing machines. More specifically it relates to a simple device which serves to transport copies produced from an automatic reproducing machine to an output station and collect them in a collated and registered fashion.
  • the set is face up with top sheet on the top and if copied according to normal procedures, the top sheet number one is copied, producing a copy face up and a set so produced has sheet number one face up on the bottom and the last sheet face up on the top. It can therefore be seen that it is desired to obtain the copies in the same order as the original set so that in the set produced by the copying machine the last sheet is on the bottom of the set and the top sheet is on the top of the set, both being face up.
  • This result may be accomplished in copying a set of sheets if the top sheet, number one sheet, is fed first to be copied and the copy produced which is image side up is inverted such that the image is on the bottom side. With copying of successive sheets of a set and inverting each copy the final set is collected face down with the top sheet on the bottom and the bottom sheet on the top.
  • inverting sheets A number of techniques have been used in the past for inverting sheets. Exemplary of the prior inverting devices are those that have long belt drives which drive the sheet up in a first direction and then back the sheet in an opposite direction using the original trailing edge as the leading edge.
  • U.S. Pat. No. 3,968,960 to Fedor et al describes a sheet inverting and stacking apparatus wherein the leading edge of a sheet is sensed at a particular location, the rotary inverter is actuated with a leading edge deflecting element engaging the leading edge to decelerate it and deflect it from its path to a stacking platform.
  • the trailing portion of the sheet is conveyed by two belt conveyors at about its original velocity and moves past the leading edge as the leading edge is deflected around an arc by the rotary inverter so that the sheet eventually is rolled over and deposited in an inverted position on the stacking tray or preceding sheet.
  • the lead edge engaging element With the difference in speed between the leading and trailing edges the lead edge engaging element is able to deflect the leading edge of a sheet downward as the belts urge the remaining portion of the sheet past the leading edge to cause inversion of the sheet.
  • the lead edge With the difference in speed, the leading edge moving slower than the trailing edge, the lead edge is constantly driven against the deflecting element thereby increasing the probability of damage to the leading edge. While lead edge damage may not be a serious problem for heavyweight papers it can be a serious problem for the lighter weight papers in that the edges may be curled, bent or crushed thereby producing untidy and even misregistered sheets in a stack or set of sheets all of which lead to user disatisfaction.
  • this apparatus has a rotatable sheet inverter wheel having at least one arcuate sheet retaining slot into which a sheet may be inserted, the slot being sufficiently long in length that a substantial portion of the sheet may be inserted in the slot without the leading edge of the sheet contacting the end of the slot.
  • the wheel is incrementally rotated from a sheet loading position to a sheet unloading position coming to rest at each position.
  • a sheet drive drives a sheet into the slot, the distance between the sheet drive and the end of the slot in the wheel being greater than the length of a sheet to be fed.
  • a sheet stripper registering member strips the sheet from within the slot in the wheel and registers the leading edge.
  • the lead edge of a sheet to be inverted is not contacted by any surface, nor is the lead edge jammed against a stop surface. Furthermore since a substantial portion of the sheet is held within the slot, the possibility of damage to it is substantially reduced.
  • the inverter wheel comprises a fixed member having a generally cylindrical surface from the load position to the unload position and two parallel arcuate arms of larger diameter having parallel slots therein for transporting sheets from the load to the unload position the slots being sufficiently long in length that a major portion of the sheet may be inserted in the slot. To achieve this result the wheel is brought to a stop at both the load and unload positions.
  • FIG. 1 is a schematic representation in cross-section of an automatic xerographic reproducing apparatus employing the sheet inverter and stacker of the present invention.
  • FIG. 2 is an isometric view from the right front of the sheet inverter and stacker of the present invention.
  • FIGS. 3A, 3B and 3C are enlarged schematic representation in cross-section showing the location of a sheet and the inverter stacker at three separate points in the operational cycle.
  • FIG. 1 there is shown by way of example an automatic xerographic reproducing machine 10 which incorporates the sheet inverter and stacker of the present invention.
  • the reproducing machine 10 depicted in FIG. 1 illustrates the various components utilized therein for producing copies from an original.
  • the sheet inverter and stacker of the present invention is particularly well adapted for use in an automatic xerographic reproducing machine 10, it should become evident from the following description that it is equally well suited for use in a wide variety of machines where it is desired to invert and stack processed sheets. It is not necessarily limited in its application to the particular embodiment shown herein.
  • the reproducing machine 10 illustrated in FIG. 1 employs an image recording drum-like member 11 the outer periphery of which is coated with a suitable photoconductive material 12.
  • the drum 11 is suitably journaled for rotation within a machine frame (not shown) by means of a shaft 13 and rotates in the direction indicated by the arrow to bring the image retaining surface thereon past a plurality of xerographic processing stations.
  • Suitable drive means (not shown) are provided to power and coordinate the motion of the various cooperating machine components whereby a faithful reproduction of the original input scene information is recorded upon a sheet 14 of final support material.
  • the drum 11 moves photoconductive surface 12 through charging station 16 where an electrostatic charge is placed uniformly over the photoconductive surface 12 of the drum 11 preparatory to imaging.
  • the charging may be provided by a corona generating device.
  • the drum 11 is rotated to exposure station 17 where the charged photoconductive surface 12 is exposed to a light image of the original input scene information, whereby the charge is selectively dissipated in the light exposed regions to record the original input scene in the form of a latent electrostatic image.
  • the optical system may be a conventional scanning or stationary optics or may be an electronically controlled and actuated laser source which successively strikes the photoconductive surface as a raster scan.
  • drum 11 rotates the electrostatic latent image recorded on the photoconductive surface 12 to development station 18 where a conventional developer mix is applied to the photoconductive surface 12 rendering the latent image visible.
  • a magnetic brush development system utilizing a magnetizable developer mix having carrier granules and a toner colorant is used.
  • the developer mix is continuously brought through a directional flux field to form a brush thereof.
  • the electrostatic latent image recorded on photoconductive surface 12 is developed by bringing the brush of developer mix into contact therewith.
  • the developed image on the photoconductive surface 12 is then brought into contact with a sheet 14 of final support material within a transfer station 20 and the toner image is transferred from the photoconductive surface 12 to the contacting side of the final support sheet 14.
  • the final support material may be paper, plastic, etc., as desired.
  • the sheet with the image thereon is advanced to a suitable radiant fuser 21, which coalesces the transferred powdered image thereto.
  • the sheet 14 is advanced by fuser output rolls 22 to the inverter and stacker 30 of the present invention.
  • toner powder Although a preponderance of toner powder is transferred to the final support material 14, invariably some residual toner remains on the photoconductive surface 12 after the transfer of the toner powder image to the final support material 14.
  • the residual toner particles remaining on the photoconductive surface 12 after the transfer operation are removed therefrom as it moves through cleaning station 25.
  • the residual toner particles are first brought under the influence of a cleaning corona generating device (not shown) adapted to neutralize the electrostatic charge remaining on the toner particles.
  • the neutralized toner particles are then mechanically cleaned from the photoconductive surface 12 by conventional means as, for example, the use of a resiliently biased knife blade.
  • the sheets 14 of final support material processed in the automatic xerographic reproducing machine 10 can be stored in the machine within a removable paper cassette 27.
  • the inverter stacker 30 is placed at the output station of the fuser output rolls 22 such that the rolls drive a sheet to be inverted into the slot 31.
  • the inverter wheel 32 is rotated counterclockwise about 180° and the stripping registration members 42 strip the sheet from the slot 31 in the wheel 33 finally depositing the sheet in tray 44 as the wheel continues to turn.
  • the inverter stacker 30 comprises an interior stationary drum or hub 37 which is generally circular in configuration from the inverter wheel load position to the unload position and rounded from the sheet unload to load position.
  • the drum 37 has a hand indent 35 in the center to facilitate manual sheet removal should the need arise if jamming of a sheet occurs.
  • a drive shaft 34 which is driven by means not shown drives two parallel arcuate arms 33 having parallel arcuate sheet retaining slots 31 therein so that a sheet may be transported in the slots from the sheet load to the sheet unload position.
  • Sheet guides 38 mounted on shaft 39 assist in guiding a sheet into the retaining slots 31.
  • the trailing portion After insertion of the sheet as the wheels are turned and the sheet moves from the load to the unload position, the trailing portion is maintained in position against the hub 37 by sheet guides 38.
  • the parallel arms turn counterclockwise the sheet is retained within the slots 31. However as the arms turn through the bottom portion of the arc they pass through apertures 43 in the stationary hub 37.
  • the vertical stripping registration members 42 which are interposed between and on the outsides of the arms 33 strip the sheet from the slot into the sheet collecting tray 44.
  • registration of the leading edge of the sheet is achieved as the sheets abut against the members 42. Registration is also maintained as the arm rotates completely out of position, each sheet having its leading edge registered in the tray. This is readily facilitated because as each sheet is stripped from the slot 31 it drops into the tray free of friction between adjacent sheets because the velocity of the sheet being stripped is zero relative to the previous sheet in the tray.
  • the inverter wheel 32 is driven from the unload or shut down position as a sensor (not shown) senses a sheet exiting the output fuser rolls 22.
  • the inverter wheel reaches the load position with the slots 31 in arms 33 ready to accept the lead edge of the sheet being driven by the fuser output rolls 22.
  • the fuser output rolls 22 continue to drive the sheet into the slot 31 until the sheet is clear of the rolls.
  • the distance between the fuser output rolls and the end of the slot 31 is longer than the length of any sheet likely to be fed to the inverter.
  • the inverter assembly is placed sufficiently close to the fuser output rolls and the slot 31 is sufficiently long that a substantial portion of the sheet at least is inserted in the slots 31. This portion should be sufficient to maintain physical control over the sheet when it travels from the load to the unload position. In ensuring control over the sheet preferably a majority of the sheet is inserted in the slots. This permits a greater percentage of the sheet to be touched by the sides of the slot and by friction with the slot surfaces transported while in the slots to the unload position. During sheet insertion the inverter wheel 30 is stationary to facilitate predictable sheet insertion on each cycle.
  • the inverter wheel 32 is rotated counterclockwise to the unload position and carries with it the sheet to be inverted.
  • the lead edge of the sheet in the slots comes into contact with the stripping registration members 42 which inhibit further travel of the sheet.
  • the inverter wheel continues to rotate until the arms 33 have cleared the sheet stripping zone.
  • each sheet is sheared off the arcuate slots one at a time by the stripping members 42 and when the trailing edge of the arms 33 has cleared the leading edge of the sheet the sheet floats down into the sheet stacking tray.
  • FIG. 3A shows the leading edge of the sheet entering the slot 31 while being driven by the fuser output rolls 22.
  • FIG. 3B depicts the sheet positioned in the slot after sheet insertion when the sheet has exited the output fuser rolls. During this operation the inverter has remained stationary while the sheet has gently slid down the slot without the leading edge being abutted against the slot end. As may also be observed, the majority of the sheet is captured within the slot 31.
  • FIG. 3C shows the trailing edge of the arm 33 clear of the sheet stripping and registration members 42 as the sheet is about to gently fall while being registered against the stripping and registration member with the tray 44.
  • the above described inverting and stacking device has the advantage of simplicity in design and operation as well as maintaining a great degree of predictable control over the operation while minimizing the opportunity for damage to the sheet, particularly the leading edge. It has the additional advantage in that it simultaneously inverts the sheet while registering the leading edge of successive sheets. Furthermore by stopping the inverter wheel in the load position there is no relationship between the inverter speed and the sheet input speed and thus the inverter speed may be considered independent of the process speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Discharge By Other Means (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
US06/182,340 1980-08-29 1980-08-29 Sheet inverting and stacking apparatus Expired - Lifetime US4385756A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/182,340 US4385756A (en) 1980-08-29 1980-08-29 Sheet inverting and stacking apparatus
JP56131441A JPS5772559A (en) 1980-08-29 1981-08-21 Device for inverting and stacking sheet
GB8126116A GB2082550B (en) 1980-08-29 1981-08-27 Inverting and stacking sheets in a photocopier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/182,340 US4385756A (en) 1980-08-29 1980-08-29 Sheet inverting and stacking apparatus

Publications (1)

Publication Number Publication Date
US4385756A true US4385756A (en) 1983-05-31

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US06/182,340 Expired - Lifetime US4385756A (en) 1980-08-29 1980-08-29 Sheet inverting and stacking apparatus

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US (1) US4385756A (enrdf_load_stackoverflow)
JP (1) JPS5772559A (enrdf_load_stackoverflow)
GB (1) GB2082550B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4454811A (en) * 1982-05-04 1984-06-19 Zvs Vyzkumnevyvojovy Ustav, Koncernova Ucelova Organizace Device for automatic engagement of printing sets under pressure
US4579446A (en) * 1982-07-12 1986-04-01 Canon Kabushiki Kaisha Both-side recording system
US4788575A (en) * 1986-01-29 1988-11-29 Minolta Camera Kabushiki Kaisha Copying machine for detecting a workable document turnover unit
US5013026A (en) * 1988-06-22 1991-05-07 Xerox Corporation Sheet stacking and inverting apparatus
US5065996A (en) * 1990-08-17 1991-11-19 Xerox Corporastion Disk stacker including movable gate for insertion of sheets into disk slots
US5065997A (en) * 1990-02-26 1991-11-19 Xerox Corporation Sheet inverter and stacking apparatus
US5098080A (en) * 1990-12-19 1992-03-24 Xerox Corporation Ski jump stack height sensor
US5145167A (en) * 1990-08-17 1992-09-08 Xerox Corporation Disk stacker including trail edge transport belt for stacking short and long sheets
US6238046B1 (en) 1999-10-04 2001-05-29 Xerox Corporation Liquid ink printer including a variable throughput active-passive wet sheet dryer assembly
US6575461B1 (en) 2001-12-05 2003-06-10 Xerox Corporation Single/double sheet stacker
US20210323783A1 (en) * 2020-04-20 2021-10-21 Canon Production Printing Holding B.V. Sheet flipping device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0662237B2 (ja) * 1985-04-12 1994-08-17 ゼロツクス コーポレーシヨン シートスタツク装置
GB8509462D0 (en) * 1985-04-12 1985-05-15 Xerox Corp Sheet-stacking apparatus
GB8721744D0 (en) * 1987-09-16 1987-10-21 De La Rue Syst Sheet feeding apparatus
US5037082A (en) * 1987-12-14 1991-08-06 Xerox Corporation Inverterless document handler

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512771A (en) * 1968-06-05 1970-05-19 Sperry Rand Corp Synchronizing device for a high speed sheet stacking system
US3847384A (en) * 1973-01-30 1974-11-12 Smithe Machine Co Inc F L Apparatus for collating sheet like elements
US3904192A (en) * 1973-02-23 1975-09-09 Agfa Gevaert Ag Apparatus for manipulating sheets in copying machines
US3968960A (en) * 1974-12-11 1976-07-13 International Business Machines Corporation Sheet inverting and stacking apparatus
US4052053A (en) * 1976-01-28 1977-10-04 Fuji Giken Kabushiki Kaisha Stacker drum of sheet accumulating device
US4060231A (en) * 1976-10-01 1977-11-29 Anton Rudolph Stobb Apparatus and method for stacking sheets
US4088314A (en) * 1977-04-22 1978-05-09 Eastman Kodak Company Synchronous stacking device
US4120491A (en) * 1976-06-19 1978-10-17 Gustav Weyland Kg Sheet stacking apparatus
US4275874A (en) * 1979-02-21 1981-06-30 Brandt-Pra, Inc. Extended stacker

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US2031136A (en) * 1934-04-14 1936-02-18 Chicago Daily News Inc Controlling delivery fan
US3912255A (en) * 1973-10-18 1975-10-14 Pennsylvania Res Ass Inc Stackers for document counters and the like
DE2844954A1 (de) * 1977-10-19 1979-04-26 De La Rue Crosfield Vorrichtung zum stapeln flexibler boegen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512771A (en) * 1968-06-05 1970-05-19 Sperry Rand Corp Synchronizing device for a high speed sheet stacking system
US3847384A (en) * 1973-01-30 1974-11-12 Smithe Machine Co Inc F L Apparatus for collating sheet like elements
US3904192A (en) * 1973-02-23 1975-09-09 Agfa Gevaert Ag Apparatus for manipulating sheets in copying machines
US3968960A (en) * 1974-12-11 1976-07-13 International Business Machines Corporation Sheet inverting and stacking apparatus
US4052053A (en) * 1976-01-28 1977-10-04 Fuji Giken Kabushiki Kaisha Stacker drum of sheet accumulating device
US4120491A (en) * 1976-06-19 1978-10-17 Gustav Weyland Kg Sheet stacking apparatus
US4060231A (en) * 1976-10-01 1977-11-29 Anton Rudolph Stobb Apparatus and method for stacking sheets
US4088314A (en) * 1977-04-22 1978-05-09 Eastman Kodak Company Synchronous stacking device
US4275874A (en) * 1979-02-21 1981-06-30 Brandt-Pra, Inc. Extended stacker

Non-Patent Citations (1)

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Title
Monday, J. L. "Tined Stacker Wheel," IBM Technical Disclosure Bulletin, vol. 18, No. 7, Dec. 1975, pp. 2273-2274.

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4454811A (en) * 1982-05-04 1984-06-19 Zvs Vyzkumnevyvojovy Ustav, Koncernova Ucelova Organizace Device for automatic engagement of printing sets under pressure
US4579446A (en) * 1982-07-12 1986-04-01 Canon Kabushiki Kaisha Both-side recording system
US4788575A (en) * 1986-01-29 1988-11-29 Minolta Camera Kabushiki Kaisha Copying machine for detecting a workable document turnover unit
US5013026A (en) * 1988-06-22 1991-05-07 Xerox Corporation Sheet stacking and inverting apparatus
JPH0729716B2 (ja) 1988-06-22 1995-04-05 ゼロックス コーポレーション シート逆転・積重ね装置
US5065997A (en) * 1990-02-26 1991-11-19 Xerox Corporation Sheet inverter and stacking apparatus
US5065996A (en) * 1990-08-17 1991-11-19 Xerox Corporastion Disk stacker including movable gate for insertion of sheets into disk slots
US5145167A (en) * 1990-08-17 1992-09-08 Xerox Corporation Disk stacker including trail edge transport belt for stacking short and long sheets
US5098080A (en) * 1990-12-19 1992-03-24 Xerox Corporation Ski jump stack height sensor
US6238046B1 (en) 1999-10-04 2001-05-29 Xerox Corporation Liquid ink printer including a variable throughput active-passive wet sheet dryer assembly
US6575461B1 (en) 2001-12-05 2003-06-10 Xerox Corporation Single/double sheet stacker
US20210323783A1 (en) * 2020-04-20 2021-10-21 Canon Production Printing Holding B.V. Sheet flipping device

Also Published As

Publication number Publication date
JPS5772559A (en) 1982-05-06
JPH0220537B2 (enrdf_load_stackoverflow) 1990-05-09
GB2082550A (en) 1982-03-10
GB2082550B (en) 1984-07-25

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